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Jerry Hall convinced Mick Jagger to quit drugs only after she warned him of the damage they'd do his looks, according to a royal socialite who knows the couple.

Her Serene Highness Princess Josephine zu Loewenstein-Werthem-Freudenberg, Countess of Loewenstein-Scharffeneck made the revelation to the Daily Mail while promoting her new memoir, titled Wind in My Hair: A Kaleidoscope of Memories, which recounts her decades of mingling with the royal family, politicians, celebrities and, through her late husband, the Rolling Stones.

Princess Josephine, as she tends to be referred, is long-time friends with both Jagger and Hall, having been married to the Stones' financial adviser Prince Rupert Loewenstein, who also served as godfather to Jagger's son James.

According to the Princess, Hall's warnings about Jagger's looks convinced him to entirely shift his health priorities. As a result, he is now remarkably clean-living, and can't even stomach half a glass of wine.

"He's very susceptible to that kind of thing. Maybe it's an allergy," she quipped. "He also likes things quiet. Once, he said: 'If people start using mobile phones on Mustique, I'm going to leave!'", which is a first-world quote if there ever was one.

Clean-living: Jerry Hall and Mick Jagger in 1992Credit:
Philip Hollis

She also praised Hall as a mother, and revealed she is "thrilled" at her recent marriage to media magnate Rupert Murdoch.

"She was a wonderful mother — those children have such lovely manners — and was a wonderful wife," she said, before recalling that Hall and Jagger never legally married. "I suppose she wasn't a wife, but she cleaned him up."